William and Harry's mum (5)
I believe the answer is:
diana
'william and harry's mum' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for diana that I've seen before include "Dame - Rigg, actress" , "Roman goodess of hunting or tragic English princess" , "Roman equivalent of Artemis" , ""The People's Princess"" , "Roman goddess of the moon and hunting" .)